BB-Indicator-Parameter-Restrict-Selection

The only method of restriction available here is to restrict it to smoothers only using ParameterType.Smoother.

You could add strings to a Parameter's Choices list, but you don't get the Indicator integration for setting Parameters with that.

What about an additional optional parameter for AddIndicatorParameter() which specifies a user supplied callback which in turn allows to filter the Indicator List?

Could look like this:

CODE:
AddIndicatorParameter("MagicIndi", "XYZ", ParameterType.Callback,
             MyMagicFilter); 

And MyMagicFilter could be a user supplied routine like this:

CODE:
bool MyMagicFilter(IndicatoerBase ib)
{
   if(ib.Abbrev == "Magic") return true;
   return false;
}

I think this would make the BuildingBlocks even more user friendly and less error prone.

ParameterType.Smoother does not work as expected. It produces code which expects another <indicator>

???

Yes, sorry about that.

Feel free to introduce a new #FeatureRequest for new functionality.